94 Wisconsin Academy of Sciences, Arts, and Letters. 



An interrogation point was also placed after Acalypha vir- 

 ginica where given as a host of Peronospora euphorbiae Fckl. in 

 the provisional list because the quantity collected was insufficient 

 for determination. Further search has been fruitless save for 

 one conidiophore. 



Plasmopara ribicola Schroet. The young oospores of this 

 species that I have seen are few, scattered, globular, smooth, 

 26-33/x in diameter. The oogonial wall is often symmetrically 

 thickened on two opposite sides. 



Protomyces fuscus Pk. appears to be a race of Plasmo- 

 para pygmaea (Ung.) Schroet. that produces oospores abund- 

 antly but conidia not at all. I have had this form under obser- 

 vation for a number of years with reference to the appearance 

 of conidia. The similarity of the spores to the oospores of Plas- 

 mopara pygmaea (Ung.) Schroet. and the presence of antheridia 

 indicate the character of the fungus. I label it Plasmopara 

 pygmaea var. fusca (Pk.) although it loses the character of the 

 genus with the suppression of conidia. 



Protomyces andinus Pat. In 1911 this was collected at Butter- 

 nut and Madison on Bidens with but few scattered resting spores 

 and no hypertrophy of the host. Examination of fixed material 

 of this kind showed the nuclei to be degenerating. I have not 

 seen it on Bidens since although abundant on Ambrosia. 



Septoria alnifolia Ell. & Evht. A hypophyllus Septoria on 

 Alnus incana collected at Madison is probably of this species but 

 doubtfully distinct from S. alni Sacc. 



Septoria dentariae Pk. It is probable that this may properly 

 be referred to S. sisymbrii Ellis as was done in the preliminary 

 list. There is no question, however, as to its being the fungus 

 that was later described by Peck under this name. Hennings 

 & Ranojevic have proposed the name Septoria sisymbrii for a 

 Servian fungus (Ann. Mycol. 10:390 (1910) which is perhaps 

 not distinct from the American plant, but I have not seen Kab. 

 & Bub. Fungi Imp. Exs. 557 . 



Gloeosporium saccharinum Ell. & Evht. (Proc. Acad. Nat. Sci. 

 Phila. 1891, pp. 82-83) appears to have been founded upon ma- 

 terial of an unusual character in which the fungus had run 



